| 摘要 |
An optical angle measuring apparatus for measuring the angular displacement of a polygon with light reflecting facets, for use, e.g., in machine tools. The apparatus comprises an autocollimator for projecting collimated light beams onto a facet of a polygon, a matrix array detector for detecting and transducing into angle measuring data the location of the focused light reflected from the polygon facets, a processor and angle error memory unit; for computing the difference between the angles of any given facet and an adjacent facet relative to a respective angle of an ideal regular polygon, and a control unit for processing and compensating for the said angle data to yield a corrected angle measurement. The corrected angle measurement is displayed on display means. A method for measuring the angular displacement of an object relative to a reference position employing the apparatus is also disclosed.
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